I was doing an incremental send between pools, the receive side is
locked up and no zfs/zpool commands work on that pool.
The stacks look different from those reported in the earlier "ZFS
snapshot send/recv "hangs" X4540 servers" thread.
Here is the process information from scat (other commands hanging on the
pool are also in cv_wait):
SolarisCAT(live/10X)> proc -L 18500
addr PID PPID RUID/UID size RSS
swresv time command
================== ====== ====== ========== ========== ======== ========
====== =========
0xffffffc8d1990398 18500 14729 0 5369856 2813952
1064960 32 zfs receive -v -d backup
==== user (LWP_SYS) thread: 0xfffffe84e0d5bc20 PID: 18500 ====
cmd: zfs receive -v -d backup
t_wchan: 0xffffffffa0ed62a2 sobj: condition var (from
zfs:txg_wait_synced+0x83)
t_procp: 0xffffffc8d1990398
p_as: 0xfffffee19d29c810 size: 5369856 RSS: 2813952
hat: 0xfffffedb762d2818 cpuset:
zone: global
t_stk: 0xfffffe8000143f10 sp: 0xfffffe8000143b10 t_stkbase:
0xfffffe800013f000
t_pri: 59(TS) pctcpu: 0.000000
t_lwp: 0xfffffe84e92d6ec0 lwp_regs: 0xfffffe8000143f10
mstate: LMS_SLEEP ms_prev: LMS_SYSTEM
ms_state_start: 15 minutes 4.476756638 seconds earlier
ms_start: 15 minutes 8.447715668 seconds earlier
psrset: 0 last CPU: 2
idle: 102425 ticks (17 minutes 4.25 seconds)
start: Thu Jul 2 22:23:06 2009
age: 1029 seconds (17 minutes 9 seconds)
syscall: #54 ioctl(, 0x0) (sysent: genunix:ioctl+0x0)
tstate: TS_SLEEP - awaiting an event
tflg: T_DFLTSTK - stack is default size
tpflg: TP_TWAIT - wait to be freed by lwp_wait
TP_MSACCT - collect micro-state accounting information
tsched: TS_LOAD - thread is in memory
TS_DONT_SWAP - thread/LWP should not be swapped
pflag: SKILLED - SIGKILL has been posted to the process
SMSACCT - process is keeping micro-state accounting
SMSFORK - child inherits micro-state accounting
pc: unix:_resume_from_idle+0xf8 resume_return: addq $0x8,%rsp
unix:_resume_from_idle+0xf8 resume_return()
unix:swtch+0x12a()
genunix:cv_wait+0x68()
zfs:txg_wait_synced+0x83()
zfs:dsl_sync_task_group_wait+0xed()
zfs:dsl_sync_task_do+0x54()
zfs:dmu_objset_create+0xc5()
zfs:zfs_ioc_create+0xee()
zfs:zfsdev_ioctl+0x14c()
genunix:cdev_ioctl+0x1d()
specfs:spec_ioctl+0x50()
genunix:fop_ioctl+0x25()
genunix:ioctl+0xac()
unix:_syscall32_save+0xbf()
-- switch to user thread's user stack --
The box is an x4500, Solaris 10u7.
--
Ian.
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